Rotary cutter



TTTTTTTTTTTT R www the tool positively PATENTJ OFFICE.

FBANK P. KILLER, OF MEADVILLE, PENNSYLVANIA.

no'rnmr Application flled Hay 11,

This invention relates to rotary cutters of the inserted blade type and more particularly to the means for securing the blades in lace. p rl`he invention forming the subject of this application has for one of its principal aims the provision of simple means whereby the blades may be easily and quickly adjusted and subsequently locked in place in such a manner that endwise and edgewise shifting' of the blades is avoided.

More specifically, an object of the invention is to provide a rotary cutter of the inserted blade type in which the blades and the carrier therefor have interfitting serrations which in addition to being useful in the adjustment of the cutting diameter of take the end thrust on the blades, the said serrations on the blades and the carrier being firmly held in interlocking relation by means of separatel Wedging means.

Other objects and advantages Will be apparent during the course of the following descri tion. v

In t e accompanying drawings formin a part of this lapplication and in which like numerals' are employed to designate like parts throughout the same,

Figure 1 is a fragmentary perspective of a rotary cutter embodying the invention;

Figure 2 is a detail longitudinal sectional view through the improved rotary cutter, one of the blades and the w'edging means therefor being shown in elevati0n;

Figure 3 is a detail transverse sectional view through the improved rotary cutter;

Firure 4 is a fragmentary perspective illustra in one of the blades and the supportin and olding means therefor;

gure 5 is-a fragmentary perspective illustrating a slight modification of the invention Figure 6 is a detail longitudinal sectional.

view through the construction shown in Figure 5;

Figure 7 is a. detail transversesectional view through the construction shown in Fi ure 5;

-i'gure 8 is a fragmentary perspective of one .of the blades shown in Figure 5 and the supportin and holding means therefor.

In the rawings, the numeral 5 designates a carrier or body' having longitudinal grooves openin out through the eri hery thereof and a apted to receive la es 6.

bindil'ir engagement with the blade.

cu'rrnn.

1926. Serial No. 108,296.

The blades may, of course, be provided with conventional or other cutting edges.

. Figure 4 illustrates that one side of each blade 6 is provided with serrations or ribs 7 extending at an angle of about fort -five degrees to the longitudinal axis of t e cutter and `ada'pted to interfit with similarly extending serrations 8 in one side wall of the associated groove whereby the end thrust on the blade is transmitted to the carrier.

Particular attention is directed to the fact that each blade is adapted to fiatly seat upon the bottom wall of the associated groove and that when t is desired to change the cutter diameter of the tool it is merely necessary to first disengage the serrations 7 from theserrations 8 and then move the blade longituditioned in the assooiated groove the same may be locked firmly in place by means of a Wedge 10, which as clearly shown in Figures 3 and 4- is provided with side walls which diverge toward the periphery of the cutter, The Wedge 10 is adapted to be positioned between one side of the associated blade and one side wall of the groove in which it is located and is forced inwardly into binding engagement With the blade by means of a longitudinally tapered key 11.

In carrying out the invention, the tapered key 11 is confined between and has pressure contact with the outer wall of a groove 12 in one side wall of the main groove and the inner Wall of a groove 14 in the opposed side of the wedge 10. In other words, one side wall of the groove and one side wall of the Wedge 10 are provided With opposed spaced shoulders between whichthe tapered key 11 is driven to force the Wedge inwardly ,ilntlo e tapere key when driven into the position shown in Figures 2 and 3 will positively hold the blade in interlocking engavement with one side wall of the roove so that edgewise movement of the bla e is efectively avoided. Thearrangement described rovides for the accurate and expeditious a justment of the blades which are, of course, arranged in an annular series about the cutter 5.

Referring to Figures 2, 3' and 4 it will be seen that one side wall of each groove is cut away to accommodate the wedges 10 in all positious which it may occupy and that the inner edge of each Wedge is at all times spaced from contact with the adjacent portion of thewall of the groove so that the wedge -has a reasonable range of movement.

In summarizing the description of the invention shown. in Figures-l to 4 inclusive it will be seen that the same consists of a carrier having a groove for the reception of a 5 to 8, inclusive, the carrier is designated by and receiving bla sio the numeral 15 and is provided with grooves opening out through the periphery thereof es 16, the side walls of which may be serrated or formed with ribs as indicated at 17 and these ribs are adapted to interfit with ribs 18 in the opposed side of the associated groove. When the ribs 17 and 18 are in interfitting relation, as Suggested in Figure 7, the end thrust on the blades is transmitted to the carrier and this avoids the necessity of employing a separate screw or other device forl taking the end thrust.

Each blade may be forced laterally into firm lockin :engagement with the serrated side wall o the associated groove by means of a wed e 19, which as shown in Figures 7 and 81s tapered toward the outer edge thereof and when driven outwardly will exert a lateral pressure on the blade and thereby holdthe same firmly inplace. Figure 7 plainly illustrates that one side wall of the groove is extended at an angle to the other side wall of thel groove for contact by the opposed face of the Wedge 19 whereby the Wedge is moved laterally into pressure contact, as previously stated, with the blade. In carrying out'the invention, each Wedge i member is moved outwardly to wedging position by a tapered key 20, the said key being confined between the inner edge of the Wedge 19 and a shoulder 21 in one side wall of the groove. In this connection, it is noted that one side wall of each groove is provided with a double rabbet by means ,of which the shoulder 21 is formed and by means of which the recess with`the inclined side wall 22 is defined for contact by the opposed surface of the Wedge 19.

-The invention forming the subject matter -of this application:` has been illustrated as applied to a milling cutter, but it is obvious that the inventive idea may be carried out in connection with reamers, counter borers, boring bars, and the like, without departing from the spirit of the invention and the scope'of what is claimed. i

Having thus described the invention, what Is olanned is:

1. A rotary cutter comprising a carrier V 1,71e,ss7

having grooves, blades in said grooves, wedges between the sides of said grooves and the sides of said blades, and tapered keys extending lengthwise of said wedges and engaged therewith to move the same into pressure and retaining contact with the blades.

2. A rotary cutter comprising a carrier having grooves, blades in said grooves, wedges between the sides of said grooves and the sides of said blades, and tapered keys engaged with said wedges to move the same into pressure and retaining contact with said blades, said blades and the Sides of said grooves being provided with angularly extending, interfitting serrations transmitting the end thrust on the blades to the carrier.

3. An inserted blade rotary cutter comprising a carrier having grooves provided with serrated side walls, blades in said grooves and having serrations interfitting with the serrations of the side walls of said grooves, wedges having side walls diverging toward the outer edges thereof and contacting with the blades and the side walls of the grooves, said wedges and the side walls of said grooves being provided with spaced shoulders, and tapered keys engaged With said shoulders and holding the Wedge members in pressure contact w1th` said blades. 4. An inserted blade rotary cutter comprising a carrier having grooves provided with serrated side Walls, blades inI said grooves and having serrations interfitting with the serrations of the side walls of said grooves, wedges contacting with the blades and the side |walls of the grooves, said wedges and the side walls of said grooves being provided with spaced shoulders, and keys engaged with said shoulders, the opposed surfaces of wedges and said blades being plain.

5. An inserted blade rotary cutter comprising a carrier `having grooves, blades in said grooves, inwardly tapered wedges confined between the sides of said grooves and said blades, said grooves being provided in the side walls thereof with longitudinal recesses, said wedges being provided with longitudinal recesses, and tapered keys in said reeesses.

6. An inserted blade rotary' cutter comprising a carrier having grooves, blades in said grooves, wedges confined between the sides of said grooves and said blades, said grooves being provided in the side Walls thereof -with longitudinal recesses, said wedges being provided with longitudinal recesses, and tapered keys in said recesses, the opposed side walls of said blades and said grooves being provided .with interfitting serrations.

7. A rotary cutter comprising a carrier having grooves, blades receivedin Lsaid grooves, the sides of said blades and the side Walls of said grooves being provided With interfitting serrations, Wedges eonfined between said blades and the side Walls of said grooves, and keys engaged with the inner edgos of said Wedges and foreing the Wedges into pressure contact With the blades.

8. A rotary eutter of the inserted blade type coinprising a carrier having grooves, rutters in said grooves, the side Walls of said grooves being stepped thereby defining shoulders, Wedges in said grooves and engaged with the sides of said blades, and tapered keys confined between the inner edges of said wodges and said shoulders.

9. A rotary eutter comprising a carrier having grooves, eutters in said grooves, the

lside walls of said grooves being stepped thereby defining` shoulders and reeesses, Wedges in said recesses and engaged With the sides of said blades, and keys between said Wedges and said shoulders, one Wall of each recess being at an angle to the plane of the adjacent blade.

10. An inserted blade rotary cutter com; prising a carrier having grooves provided With stepped side Walls defining shoulders and recesses, blades in said grooves, Wedges in said recesses and having pressure contact With said blades, and keys confined between said shoulders and the inner edges of said wedges, the opposed surfaces of said Wedges and said blades being plain.

11. An inserted blade rotary cutter comprising a carrier having grooves provided with stepped side Walls defining shoulders and reeesses, blades in said grooves, Wedges in said reeesses and having pressure contact with said blades, and tapered keys eonfined between said shoulders and the inner edges of said Wedges, the opposed surfaces of said blades and the walls of said grooves being provided With interfitting serrations extending at an angle to the axis of the cutter.

In testiinony Whereof I aflix my Signature.

FRANK P. MILLER. 

